void ProcessParameterChange(DataPacket packet)
{
_parameterChangePacket = null;
// try to do a stream header...
var wasPeek = false;
var doFullReset = false;
if (ProcessStreamHeader(packet))
{
packet.Done();
wasPeek = true;
doFullReset = true;
packet = _packetProvider.PeekNextPacket();
if (packet == null)
{
throw new InvalidDataException("Couldn't get next packet!");
}
}
// try to do a comment header...
if (LoadComments(packet))
{
if (wasPeek)
{
_packetProvider.GetNextPacket().Done();
}
else
{
packet.Done();
}
wasPeek = true;
packet = _packetProvider.PeekNextPacket();
if (packet == null)
{
throw new InvalidDataException("Couldn't get next packet!");
}
}
// try to do a book header...
if (LoadBooks(packet))
{
if (wasPeek)
{
_packetProvider.GetNextPacket().Done();
}
else
{
packet.Done();
}
}
ResetDecoder(doFullReset);
}
public void ProcessParameterChange(DataPacket packet)
{
_parameterChangePacket = null;
bool flag = false;
bool isFullReset = false;
if (ProcessStreamHeader(packet))
{
packet.Done();
flag = true;
isFullReset = true;
packet = _packetProvider.PeekNextPacket();
if (packet == null)
{
throw new InvalidDataException("Couldn't get next packet!");
}
}
if (LoadComments(packet))
{
if (flag)
{
_packetProvider.GetNextPacket().Done();
}
else
{
packet.Done();
}
flag = true;
packet = _packetProvider.PeekNextPacket();
if (packet == null)
{
throw new InvalidDataException("Couldn't get next packet!");
}
}
if (LoadBooks(packet))
{
if (flag)
{
_packetProvider.GetNextPacket().Done();
}
else
{
packet.Done();
}
}
ResetDecoder(isFullReset);
}
internal bool TryInit()
{
var initialPacket = _packetProvider.GetNextPacket();
// make sure it's a vorbis stream...
if (!initialPacket.ReadBytes(7).SequenceEqual(new byte[] { 0x01, 0x76, 0x6f, 0x72, 0x62, 0x69, 0x73 }))
{
_glueBits += initialPacket.Length * 8;
return(false);
}
_glueBits += 56;
// now load the initial header
ProcessStreamHeader(initialPacket);
// finally, load the comment and book headers...
DataPacket commentsPacket = null, booksPacket = null;
while (commentsPacket == null || booksPacket == null)
{
var packet = _packetProvider.GetNextPacket();
if (packet.IsResync)
{
throw new InvalidDataException("Missing header packets!");
}
if (!_pagesSeen.Contains(packet.PageSequenceNumber))
{
_pagesSeen.Add(packet.PageSequenceNumber);
}
switch (packet.PeekByte())
{
case 1: throw new InvalidDataException("Found second init header!");
case 3: LoadComments(packet); commentsPacket = packet; break;
case 5: LoadBooks(packet); booksPacket = packet; break;
}
}
// tell the packets that we're done with them
initialPacket.Done();
commentsPacket.Done();
booksPacket.Done();
// get the decoding logic bootstrapped
InitDecoder();
return(true);
}
internal bool TryInit()
{
if (!ProcessStreamHeader(_packetProvider.PeekNextPacket()))
{
return(false);
}
_packetProvider.GetNextPacket().Done();
DataPacket nextPacket = _packetProvider.GetNextPacket();
if (!LoadComments(nextPacket))
{
throw new InvalidDataException("Comment header was not readable!");
}
nextPacket.Done();
nextPacket = _packetProvider.GetNextPacket();
if (!LoadBooks(nextPacket))
{
throw new InvalidDataException("Book header was not readable!");
}
nextPacket.Done();
InitDecoder();
return(true);
}
void DecodeNextPacket()
{
_sw.Start();
DataPacket packet = null;
try
{
// get the next packet
var packetProvider = _packetProvider;
if (packetProvider != null)
{
packet = packetProvider.GetNextPacket();
}
// if the packet is null, we've hit the end or the packet reader has been disposed...
if (packet == null)
{
_eosFound = true;
return;
}
// keep our page count in sync
if (!_pagesSeen.Contains((_lastPageSeen = packet.PageSequenceNumber)))
{
_pagesSeen.Add(_lastPageSeen);
}
// check for resync
if (packet.IsResync)
{
ResetDecoder(false); // if we're a resync, our current decoder state is invalid...
}
// check for parameter change
if (packet == _parameterChangePacket)
{
_isParameterChange = true;
ProcessParameterChange(packet);
return;
}
if (!UnpackPacket(packet))
{
packet.Done();
_wasteBits += 8 * packet.Length;
return;
}
packet.Done();
// we can now safely decode all the data without having to worry about a corrupt or partial packet
DecodePacket();
var samplesDecoded = OverlapSamples();
// we can do something cool here... mark down how many samples were decoded in this packet
if (packet.GranuleCount.HasValue == false)
{
packet.GranuleCount = samplesDecoded;
}
// update our position
UpdatePosition(samplesDecoded, packet);
// a little statistical housekeeping...
var sc = Utils.Sum(_sampleCountHistory) + samplesDecoded;
_bitsPerPacketHistory.Enqueue((int)packet.BitsRead);
_sampleCountHistory.Enqueue(samplesDecoded);
while (sc > _sampleRate)
{
_bitsPerPacketHistory.Dequeue();
sc -= _sampleCountHistory.Dequeue();
}
}
catch
{
if (packet != null)
{
packet.Done();
}
throw;
}
finally
{
_sw.Stop();
}
}
private VorbisStreamDecoder.PacketDecodeInfo UnpackPacket(DataPacket packet)
{
if (packet.ReadBit())
return (VorbisStreamDecoder.PacketDecodeInfo) null;
VorbisStreamDecoder.PacketDecodeInfo packetDecodeInfo = new VorbisStreamDecoder.PacketDecodeInfo();
int num1 = this._modeFieldBits;
try
{
packetDecodeInfo.Mode = this.Modes[(int) packet.ReadBits(this._modeFieldBits)];
if (packetDecodeInfo.Mode.BlockFlag)
{
packetDecodeInfo.PrevFlag = packet.ReadBit();
packetDecodeInfo.NextFlag = packet.ReadBit();
num1 += 2;
}
}
catch (EndOfStreamException ex)
{
return (VorbisStreamDecoder.PacketDecodeInfo) null;
}
try
{
long bitsRead1 = packet.BitsRead;
packetDecodeInfo.FloorData = ACache.Get<VorbisFloor.PacketData>(this._channels);
bool[] buffer1 = ACache.Get<bool>(this._channels);
for (int index = 0; index < this._channels; ++index)
{
packetDecodeInfo.FloorData[index] = packetDecodeInfo.Mode.Mapping.ChannelSubmap[index].Floor.UnpackPacket(packet, packetDecodeInfo.Mode.BlockSize);
buffer1[index] = !packetDecodeInfo.FloorData[index].ExecuteChannel;
}
foreach (VorbisMapping.CouplingStep couplingStep in packetDecodeInfo.Mode.Mapping.CouplingSteps)
{
if (packetDecodeInfo.FloorData[couplingStep.Angle].ExecuteChannel || packetDecodeInfo.FloorData[couplingStep.Magnitude].ExecuteChannel)
{
packetDecodeInfo.FloorData[couplingStep.Angle].ForceEnergy = true;
packetDecodeInfo.FloorData[couplingStep.Magnitude].ForceEnergy = true;
}
}
long num2 = packet.BitsRead - bitsRead1;
long bitsRead2 = packet.BitsRead;
packetDecodeInfo.Residue = ACache.Get<float>(this._channels, packetDecodeInfo.Mode.BlockSize);
foreach (VorbisMapping.Submap submap in packetDecodeInfo.Mode.Mapping.Submaps)
{
for (int index = 0; index < this._channels; ++index)
{
if (packetDecodeInfo.Mode.Mapping.ChannelSubmap[index] != submap)
packetDecodeInfo.FloorData[index].ForceNoEnergy = true;
}
float[][] buffer2 = submap.Residue.Decode(packet, buffer1, this._channels, packetDecodeInfo.Mode.BlockSize);
for (int index1 = 0; index1 < this._channels; ++index1)
{
float[] numArray1 = packetDecodeInfo.Residue[index1];
float[] numArray2 = buffer2[index1];
for (int index2 = 0; index2 < packetDecodeInfo.Mode.BlockSize; ++index2)
numArray1[index2] += numArray2[index2];
}
ACache.Return<float>(ref buffer2);
}
ACache.Return<bool>(ref buffer1);
++this._glueBits;
this._modeBits += (long) num1;
this._floorBits += num2;
this._resBits += packet.BitsRead - bitsRead2;
this._wasteBits += (long) (8 * packet.Length) - packet.BitsRead;
++this._packetCount;
}
catch (EndOfStreamException ex)
{
this.ResetDecoder();
packetDecodeInfo = (VorbisStreamDecoder.PacketDecodeInfo) null;
}
catch (InvalidDataException ex)
{
packetDecodeInfo = (VorbisStreamDecoder.PacketDecodeInfo) null;
}
packet.Done();
return packetDecodeInfo;
}
void ProcessParameterChange(DataPacket packet)
{
_parameterChangePacket = null;
// try to do a stream header...
var wasPeek = false;
var doFullReset = false;
if (ProcessStreamHeader(packet))
{
packet.Done();
wasPeek = true;
doFullReset = true;
packet = _packetProvider.PeekNextPacket();
if (packet == null) throw new InvalidDataException("Couldn't get next packet!");
}
// try to do a comment header...
if (LoadComments(packet))
{
if (wasPeek)
{
_packetProvider.GetNextPacket().Done();
}
else
{
packet.Done();
}
wasPeek = true;
packet = _packetProvider.PeekNextPacket();
if (packet == null) throw new InvalidDataException("Couldn't get next packet!");
}
// try to do a book header...
if (LoadBooks(packet))
{
if (wasPeek)
{
_packetProvider.GetNextPacket().Done();
}
else
{
packet.Done();
}
}
ResetDecoder(doFullReset);
}
private VorbisStreamDecoder.PacketDecodeInfo UnpackPacket(DataPacket packet)
{
if (packet.ReadBit())
{
return((VorbisStreamDecoder.PacketDecodeInfo)null);
}
VorbisStreamDecoder.PacketDecodeInfo packetDecodeInfo = new VorbisStreamDecoder.PacketDecodeInfo();
int num1 = this._modeFieldBits;
try
{
packetDecodeInfo.Mode = this.Modes[(int)packet.ReadBits(this._modeFieldBits)];
if (packetDecodeInfo.Mode.BlockFlag)
{
packetDecodeInfo.PrevFlag = packet.ReadBit();
packetDecodeInfo.NextFlag = packet.ReadBit();
num1 += 2;
}
}
catch (EndOfStreamException ex)
{
return((VorbisStreamDecoder.PacketDecodeInfo)null);
}
try
{
long bitsRead1 = packet.BitsRead;
packetDecodeInfo.FloorData = ACache.Get <VorbisFloor.PacketData>(this._channels);
bool[] buffer1 = ACache.Get <bool>(this._channels);
for (int index = 0; index < this._channels; ++index)
{
packetDecodeInfo.FloorData[index] = packetDecodeInfo.Mode.Mapping.ChannelSubmap[index].Floor.UnpackPacket(packet, packetDecodeInfo.Mode.BlockSize);
buffer1[index] = !packetDecodeInfo.FloorData[index].ExecuteChannel;
}
foreach (VorbisMapping.CouplingStep couplingStep in packetDecodeInfo.Mode.Mapping.CouplingSteps)
{
if (packetDecodeInfo.FloorData[couplingStep.Angle].ExecuteChannel || packetDecodeInfo.FloorData[couplingStep.Magnitude].ExecuteChannel)
{
packetDecodeInfo.FloorData[couplingStep.Angle].ForceEnergy = true;
packetDecodeInfo.FloorData[couplingStep.Magnitude].ForceEnergy = true;
}
}
long num2 = packet.BitsRead - bitsRead1;
long bitsRead2 = packet.BitsRead;
packetDecodeInfo.Residue = ACache.Get <float>(this._channels, packetDecodeInfo.Mode.BlockSize);
foreach (VorbisMapping.Submap submap in packetDecodeInfo.Mode.Mapping.Submaps)
{
for (int index = 0; index < this._channels; ++index)
{
if (packetDecodeInfo.Mode.Mapping.ChannelSubmap[index] != submap)
{
packetDecodeInfo.FloorData[index].ForceNoEnergy = true;
}
}
float[][] buffer2 = submap.Residue.Decode(packet, buffer1, this._channels, packetDecodeInfo.Mode.BlockSize);
for (int index1 = 0; index1 < this._channels; ++index1)
{
float[] numArray1 = packetDecodeInfo.Residue[index1];
float[] numArray2 = buffer2[index1];
for (int index2 = 0; index2 < packetDecodeInfo.Mode.BlockSize; ++index2)
{
numArray1[index2] += numArray2[index2];
}
}
ACache.Return <float>(ref buffer2);
}
ACache.Return <bool>(ref buffer1);
++this._glueBits;
this._modeBits += (long)num1;
this._floorBits += num2;
this._resBits += packet.BitsRead - bitsRead2;
this._wasteBits += (long)(8 * packet.Length) - packet.BitsRead;
++this._packetCount;
}
catch (EndOfStreamException ex)
{
this.ResetDecoder();
packetDecodeInfo = (VorbisStreamDecoder.PacketDecodeInfo)null;
}
catch (InvalidDataException ex)
{
packetDecodeInfo = (VorbisStreamDecoder.PacketDecodeInfo)null;
}
packet.Done();
return(packetDecodeInfo);
}
public void DecodeNextPacket()
{
_sw.Start();
DataPacket dataPacket = null;
try
{
IPacketProvider packetProvider = _packetProvider;
if (packetProvider != null)
{
dataPacket = packetProvider.GetNextPacket();
}
if (dataPacket == null)
{
_eosFound = true;
}
else
{
if (!_pagesSeen.Contains(_lastPageSeen = dataPacket.PageSequenceNumber))
{
_pagesSeen.Add(_lastPageSeen);
}
if (dataPacket.IsResync)
{
ResetDecoder(isFullReset: false);
}
if (dataPacket == _parameterChangePacket)
{
_isParameterChange = true;
ProcessParameterChange(dataPacket);
}
else if (!UnpackPacket(dataPacket))
{
dataPacket.Done();
_wasteBits += 8 * dataPacket.Length;
}
else
{
dataPacket.Done();
DecodePacket();
int num = OverlapSamples();
if (!dataPacket.GranuleCount.HasValue)
{
dataPacket.GranuleCount = num;
}
UpdatePosition(num, dataPacket);
int num2 = Utils.Sum(_sampleCountHistory) + num;
_bitsPerPacketHistory.Enqueue((int)dataPacket.BitsRead);
_sampleCountHistory.Enqueue(num);
while (num2 > _sampleRate)
{
_bitsPerPacketHistory.Dequeue();
num2 -= _sampleCountHistory.Dequeue();
}
}
}
}
catch
{
dataPacket?.Done();
throw;
}
finally
{
_sw.Stop();
}
}
